Goodwill and Intangible Assets Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	6 Months Ended		11 Months Ended	12 Months Ended
	Dec. 29, 2023	Dec. 30, 2022	Jun. 16, 2022	Nov. 14, 2023	Dec. 27, 2024	Nov. 29, 2024
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization	$ 16.2	$ 318.7	$ 281.8	$ 449.6	$ 80.3
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	2.6	0.0	0.0	135.9	0.0
Intangible Assets, Net (Excluding Goodwill)	608.4				419.4
Intangible asset amortization	$ 16.2	$ 318.7	$ 281.8	$ 449.6	$ 80.3
Income (loss) from continuing operations	$ (1.94)	$ (45.43)	$ (3.70)	$ (122.75)	$ 24.20
Completed Technology
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible assets, gross	$ 624.6				$ 495.2
Accumulated amortization	16.2				75.8
Reorganization, Chapter11, Post Adjustment, Successor
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)			$ 3,152.2	$ 624.6
Specialty Brands [Member]
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges	2.6			50.1
Specialty Generics [Member]
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges				85.8
StrataGraft [Member] | Specialty Brands [Member]
Finite-Lived Intangible Assets [Line Items]
Other Asset Impairment Charges				50.1
StrataGraft PRV
Finite-Lived Intangible Assets [Line Items]
Other Indefinite-lived Intangible Assets			100.0
StrataGraft PRV | Mallinckrodt
Finite-Lived Intangible Assets [Line Items]
Proceeds from Sale of Intangible Assets		$ 65.0
StrataGraft PRV | General Unsecured Claims Trust
Finite-Lived Intangible Assets [Line Items]
Proceeds from Sale of Intangible Assets		35.0
Amitiza | Change in Accounting Method Accounted for as Change in Estimate
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization			21.7
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization			$ 21.7
Income (loss) from continuing operations			$ 0.26
Terlivaz
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)					55.1
Therakos
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible asset amortization	4.6	102.7	$ 35.5	142.7	16.1
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Net (Excluding Goodwill)						$ 108.7
Intangible asset amortization	$ 4.6	$ 102.7	$ 35.5	$ 142.7	$ 16.1
Finite-lived intangible assets, gross						129.4
Accumulated amortization						$ 20.7